Incandescent electric lamp



(No' Model.)

- G. A. FREI.

INGANDBSGBNT ELECTRIC LAMP.

Patented Dec. 6, 1892.

w: Nana's PETERS co. Paarounia, WASHINGTON, n. c

UNITED STATES PATENT OFFICE.

GUSTAV A. FREI, OF SPRINGFIELD, MASSACHUSETTS.

INCAN DESCENT ELECTRIC LAM P.

SPECIFICATION formingpart of Letters Patent N 0. 487,479, dated December 6, 1892.

Application filed April 11, 1892. Serial No. 428,570. (No model.)

To all whom it may concern.-

Be it known that I, GUSTAV A. FREI, a citizen of the United States, residing at Springfield, in the county of Hampden and State of Massachusetts, have invented new and useful Improvements in Incandescent Electric Lamps, of which the following is a specification.

This invention relates to improvements in electric incandescent lamps.

The object of the invention is to so construct and constitute the lamp that it becomes possible in the event of the destruction. of the filament to renew the lamp, requiring the substitution of certain only of the parts, which renewal, moreover, may be readily accomplished by persons who are not especially versed in the art to which the invention pertains and without the use of any special tools.

The invention is further designed to so generally improve the construction of an incandescent electric lamp that it isunusually simple, cheap, and easy of construction.

To these ends the invention consists in the construction and arrangement or combination of parts, all substantially as will hereinafter fully appear, and be set forth in the claims.

In the accompanying drawings, Figure 1 is a perspective view of the improved incandescent electric lamp with parts thereof in section. Fig\ 2 is a plan view of the shank end thereof. Fig. 3 is an axial section on the plane indicated by line 3 3, Fig. 2. Fig. 4 is a sectional view of one of the globes. Fig. 5

is an illustration in perspective of detail devices embodied at the shank of the lamp.

I will now proceed to describe the construction of the lamp in detail.

A represents a circular block or head of porcelain or other suitable insulating material, having its edges rabbeted, as at a, leaving the overhanging ledge b, and also having the opposing radial recesses 01 d. The block is furthermore axially bored, as seen at c. A metallic spindle e is passed through the opening 0, extending upwardly beyond the top of the block, and it has connected to its lower end the angular extension f, the portion 10 thereof lying on the under side of the block, while the upturned portion 11 is disposed within one of the said recesses 61 and has a binding-screw 12.

The ring-plate g, which is cleft at 14, is secured by riveting or otherwise upon the under face of the block A and by reason of the said cleft avoids contact with the angular spindle extension f. The said ring-plate carries the upwardly-extended metallic lug h, which is located in the recessdopposite from the one in which the extension portion 11 is disposed, and said lug has also a bindingscrew 15. The said ring-plate carries the series of downwardly-extended prongs'i t' 2', and also the downwardly and outwardly extended lug j, which lies upon the under surface of the ledge, which forms one boundary of the said rabbet at the edge of the block A. The

leading-in wires 09 and y are connected at and confined by the binding-screws 12 and 15, whence they pass downwardly through the interior supporting-stem or inverted dome it of the vial or cylindrical inclosed glass shell or globe B, which constitutes the vacuumchamber, and in which chamber, connected to the leading-in wires, as usual, is the carbon or filameht. The prongs iii, which are more or less springy,support the globe against lateral vibrations and relieve the leading-in wires from strain.

D represents a secondary globe of the usual pear form commonly employed in this class of lamps, and has its open neck surrounded by a metallic ferrule m, which is connected thereto by means of plaster-of-paris or otherwise. The ferrule hasthe inwardly-projected annular flange 18. The end of the ferrulesurrounded neck of the secondary globe is adapted to fit and be seated upon the rabbeted under side of the aforesaid block A, and the detachable confinement is made by the screws 20 20,which pass through portions of the block near its edges and into the tapped holes therefor in the end flange of the ferrule.

Thelamp constituted substantially as above described is to be set into a socket therefor, which may be of any of the well-known constructions and not necessary to herein refer to; butit will be observed, however, that when the lamp is in place in the socket the spindle has or is adapted to have electric communication with one of the current-wires for the lamp, whereby the leading-in wire y receives the current, and the other current-conveying wire for the lamp is in communication with the leading-in wire 00, because, as usual, it has connection with a part of the socket, which latter is by its fit over the globe-ferrule m in proper electrical connection with the ferrule, this ferrule in turn being in contact with the lug j, which is a part of the ring-plate g, and therefore directly in communication with the lug h, to which the leading-in wire is connected.

Users of the electric lamps are expected to be provided with duplicate globes B, having perfect filaments therein and the leading-in wires with their ends extended sufiiciently outwardly from the glass stem 76.

When a filament becomes worthless, the lamp is removed from its socket, the outer globe is taken off, and by loosening the binding-screws 12 15 the globe B and its leading-in wires are permitted to be detached from the head and another globe, the leading-in wires of which connect the arms of a perfect filament, are substituted, the free ends of said wires being connected to said binding-posts. This may be readily performed by any person who but imperfectly understands the principles and structural characteristics of the lamp, although, if deemed more desirable, each duplicated globe B may have the head A and the conjunctive metallic devices described, rendering the replacement of the globes with the burned-out filament even more quick and easy of performance.

The outer globe, in addition to affording a medium of electrical communication from the one current-conveying wire to the one leading-in wire, protects the inner globe, fora blow which might come upon the outerglobe to fracture it would not probably brea'k the inner globe. The destruction of the outer globe will not of course ait'ect the operativeness of the lamp, although in the absence of such globeitlacksthe protection which would otherwise be imparted thereby.

I claim- 1. In an incandescent electric lamp, the combination, with a head of non-conducting material having the spindle passed through it, which is provided with an extension having a binding-post and anothermetallic piece on said head also having a binding-post, of a sealed. filament-containingglobe having lead-,

in g-in wires, the outwardly-extended extremi- ..ties of which are detachably connected to said binding-screws, and a secondary globe inclosing the filament-containing globe, substantially as described.

2. In an electric incandescent lamp, the combination, with a head having insulated metallic pieces and a sealed globe having a filament and leading-in wires detachably connected to said metallic pieces, of a ferrule detach-ably connected to the head and surrounding the connection between the globe and head, substantially as described.

3. In an incandescent electric lamp, the combination, with a head provided with insulated metallic devices, each comprising binding-screws, one of said metallic devices having an extension e, which extends upwardly through and beyond the head, and the other metallic device having a memberj, which is extended laterally to the border of the head, of a filament-containing globe having leading-in wires, the free ends of which are connected by the binding-screws to said metallic devices, and the outer globe having the open neck and a metallic ferrule thereat detachably connected to the head and having the ferrule in contact with the said lnemberj, substantially as and for the purpose set forth.

4. In an incandescent electric lamp, the combination, with a headAof non-conductive material having the recesses 01 (l, of the spindle e, passed through and upwardly beyond the head and having the extension f, the angular member of which is disposed in one of said recesses, a metallic piece on the under side of the head, having the lug h located in the other of said recesses, the sealed globe B, having the filament and leading-in wires detachably connected to the said head and in electric connection with the said lug h, substantially as described.

5. In an electric incandescent lamp, the combination, with a head having insulated metallic pieces and globe'grasping devices, substantially as described, and the sealed globe B, adapted for engagement with said grasping devices and having the filament and leading-in wires detachably connected to said metallic pieces, of a ferrule surrounding the joint between the globe and head and detachably connected to the head, substantially as described.

6. In an electric incandescent lamp, the combination, with a head having the rabbet a and the recesses d d, the spindle e, passed through the head and havingthe angular extensionf with the binding-screw 12 in one of the recesses, the ring plate g, having the prongs i, and the lug h, with the bindingscrew 15, located in the other of said recesses, and the lug j, extended across the surface of the rabbet, of the globe engaged by said prongs and having the filament and leadingin wires which are detachably connected to the binding-screws and the ferrule m, seated in said rabbet and connected to the head and in contact with the lugj, substantially as and for the purpose set forth.

GUSTAV A. FREI. Witnesses:

WM. S. BELLOWS, H. A. CHAPIN. 

